1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * AMD Memory Encryption Support
4 *
5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */
9
10 #ifndef __X86_MEM_ENCRYPT_H__
11 #define __X86_MEM_ENCRYPT_H__
12
13 #ifndef __ASSEMBLY__
14
15 #include <linux/init.h>
16 #include <linux/cc_platform.h>
17
18 #include <asm/asm.h>
19 struct boot_params;
20
21 #ifdef CONFIG_X86_MEM_ENCRYPT
22 void __init mem_encrypt_init(void);
23 void __init mem_encrypt_setup_arch(void);
24 #else
25 static inline void mem_encrypt_init(void) { }
26 static inline void __init mem_encrypt_setup_arch(void) { }
27 #endif
28
29 #ifdef CONFIG_AMD_MEM_ENCRYPT
30
31 extern u64 sme_me_mask;
32 extern u64 sev_status;
33
34 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
35 unsigned long decrypted_kernel_vaddr,
36 unsigned long kernel_len,
37 unsigned long encryption_wa,
38 unsigned long encryption_pgd);
39
40 void __init sme_early_encrypt(resource_size_t paddr,
41 unsigned long size);
42 void __init sme_early_decrypt(resource_size_t paddr,
43 unsigned long size);
44
45 void __init sme_map_bootdata(char *real_mode_data);
46 void __init sme_unmap_bootdata(char *real_mode_data);
47
48 void __init sme_early_init(void);
49
50 void sme_encrypt_kernel(struct boot_params *bp);
51 void sme_enable(struct boot_params *bp);
52
53 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
54 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
55 void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr,
56 unsigned long size, bool enc);
57
58 void __init mem_encrypt_free_decrypted_mem(void);
59
60 void __init sev_es_init_vc_handling(void);
61
62 static inline u64 sme_get_me_mask(void)
63 {
64 return RIP_REL_REF(sme_me_mask);
65 }
66
67 #define __bss_decrypted __section(".bss..decrypted")
68
69 #else /* !CONFIG_AMD_MEM_ENCRYPT */
70
71 #define sme_me_mask 0ULL
72 #define sev_status 0ULL
73
74 static inline void __init sme_early_encrypt(resource_size_t paddr,
75 unsigned long size) { }
76 static inline void __init sme_early_decrypt(resource_size_t paddr,
77 unsigned long size) { }
78
79 static inline void __init sme_map_bootdata(char *real_mode_data) { }
80 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
81
82 static inline void __init sme_early_init(void) { }
83
84 static inline void sme_encrypt_kernel(struct boot_params *bp) { }
85 static inline void sme_enable(struct boot_params *bp) { }
86
87 static inline void sev_es_init_vc_handling(void) { }
88
89 static inline int __init
90 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
91 static inline int __init
92 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
93 static inline void __init
94 early_set_mem_enc_dec_hypercall(unsigned long vaddr, unsigned long size, bool enc) {}
95
96 static inline void mem_encrypt_free_decrypted_mem(void) { }
97
98 static inline u64 sme_get_me_mask(void) { return 0; }
99
100 #define __bss_decrypted
101
102 #endif /* CONFIG_AMD_MEM_ENCRYPT */
103
104 void add_encrypt_protection_map(void);
105
106 /*
107 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
108 * writing to or comparing values from the cr3 register. Having the
109 * encryption mask set in cr3 enables the PGD entry to be encrypted and
110 * avoid special case handling of PGD allocations.
111 */
112 #define __sme_pa(x) (__pa(x) | sme_me_mask)
113 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
114
115 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
116
117 #endif /* __ASSEMBLY__ */
118
119 #endif /* __X86_MEM_ENCRYPT_H__ */
120
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